Microsoft Word C037555e doc Reference number ISO 691 2005(E) © ISO 2005 INTERNATIONAL STANDARD ISO 691 Fourth edition 2005 11 01 Assembly tools for screws and nuts — Wrench and socket openings — Toler[.]
Trang 1Reference number ISO 691:2005(E)
INTERNATIONAL
691
Fourth edition 2005-11-01
Assembly tools for screws and nuts — Wrench and socket openings —
Tolerances for general use
Outils de manœuvre pour vis et écrous — Ouvertures de clés et d'embouts de serrage — Tolérances d'usage courant
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Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies) The work of preparing International Standards is normally carried out through ISO technical committees Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2
The main task of technical committees is to prepare International Standards Draft International Standards adopted by the technical committees are circulated to the member bodies for voting Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights ISO shall not be held responsible for identifying any or all such patent rights
ISO 691 was prepared by Technical Committee ISO/TC 29, Small tools, Subcommittee SC 10, Assembly tools
for screws and nuts, pliers and nippers
This fourth edition cancels and replaces the third edition (ISO 691:1997), Table 1 of which has been technically revised
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Trang 5INTERNATIONAL STANDARD ISO 691:2005(E)
Assembly tools for screws and nuts — Wrench and socket
openings — Tolerances for general use
1 Scope
This International Standard specifies tolerances on wrench and socket openings for screws and nuts (or similar parts) having metric width across flats dimensions, as shown diagrammatically below
It gives, for each dimension, the tolerances for general use, defined by its two deviations, minimum and maximum, with respect to the nominal value
These deviations have been determined in relation to the width across flats tolerances for screws and nuts specified in ISO 4759-1 and with regard to the manufacture of tightening tools
The following referenced documents are indispensable for the application of this document For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies
ISO 4759-1, Tolerances for fasteners — Part 1: Bolts, screws, studs and nuts — Product grades A, B, and C
3 Tolerances
The tolerances for the openings of wrenches, box wrenches and socket wrenches as shown in Figure 1 are given in Table 1
For wrenches, only the tolerance class 1 shall be used
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Key
3 socket wrench (closed)
Figure 1 — Wrench (open), box wrench (closed) and socket wrench (closed)
Table 1 — Tolerances on wrench and socket openings
Dimensions in millimetres
Tolerance class 1 Tolerance class 2 a
Deviations Deviations Nominal dimension
s
min max min max
a This tolerance class is only applicable to box wrenches and socket wrenches that have not been finished by material removal
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4 Designation
An opening for a wrench or socket in conformance with this International Standard shall be designated by: a) “Opening”;
b) reference to this International Standard, i.e ISO 691;
d) its tolerance class, 1 or 2
class 1 is designated as follows:
Opening ISO 691 - 18 - 1
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Trang 10ISO 691:2005(E)
ICS 25.140.30
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